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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: Environ Res. 2014 Jun 3;133:4–11. doi: 10.1016/j.envres.2014.05.006

Figure 1. PEF Changes over the Course of the Olympics among Different Groups.

Figure 1

PEF changes in subgroups. The percentage changes of PEF levels over the three time periods were compared among six subgroups in the figure. X-axis: Three time periods. Y-axis: PEF levels (L/min). “lines in different color and styles” represents different subgroups.